suck donkey balls

balls of steel

Courage, audacity.

balls to the wall

With maximum effort or commitment.

bust one's balls

To work very hard; to put in a lot of effort.

Cobblers

[Cockney slang]balls or 'bollocks'

via cobblers' awls

donkey work

Work that is difficult, boring, and routine.

drag one's balls across

To exert extreme, often aggressive, power or control over; dominate.

great balls of fire

Expressing great surprise.

grow some balls

To be brave; to show some courage, especially in a situation where one has so far failed to do so.